| Single LED flash, steadily on |
This means your Goodman furnace has no signal coming from the thermostat and won't operate. |
You should check your thermostat for an improper setting or connection. |
| Single LED flash, blinks on and off |
This means that your furnace has locked out due to too many ignition attempts. |
After one hour of lockout, your furnace will automatically reset itself. |
| Two LED flashes |
This means that the draft blower isn't functioning properly, or your furnace has a short in the pressure switch circuit. |
You should either repair the short or replace the pressure switch. |
| Three LED flashes |
This means your furnace has an open pressure switch circuit or the induced draft blower is operating when it shouldn't be. |
You should check the pressure switch hose for blocks or an improper connection. Otherwise, see if any loose wiring needs tightening. |
| Four LED flashes |
This means your furnace has a primary open limit circuit. |
You should check and clean all the filters, tighten the wiring, and see if there are any blockages in the flue. |
| Five LED flashes |
This means that your furnace senses a flame without a call for heat. |
You should check for a leaky or open gas valve or a lingering burner flame. |
| Seven LED flashes |
This warns of a low flame sense microamp signal. This is the result of a coated flame sensor or a lazy flame due to poor gas pressure. |
Adjust the gas pressure according to the information available to you. |
| Eight LED flashes |
This means your furnace has an igniter circuit problem due to a defective igniter or an improperly connected igniter. |
Replace the igniter or check the ground wiring for defects. |
| Nine LED flashes |
This means that your furnace has a high-stage pressure switch that won't close during a high-stage-induced draft blower operation. |
Check your Goodman furnace for a pinched or blocked pressure switch hose. |
| Continuous LED flashes |
This means that your furnace has a reversed polarity of 115 volts. |
You will have to correct the wiring polarity after reviewing the wiring diagram. |
